Nowadays, proxy signature is one of research hotspots in the field of information technology. However, most researches focus on the theory and its analysis, there is few application researches, in particular, applications based on threshold proxy signature are less than others. In the real life, there are many drawbacks in the local oral defense system and more and more unfairness has been shown. Based on the threshold proxy signature scheme from the bilinear-pairing, online oral defense system is proposed. The system consists of main sever, oral defense experts, oral defense students, oral defense secretary and CA (Certificate Authority). It mainly characterizes easily confirming oral defense experts authorized by main server and the oral defense experts can’t deny their own oral defense suggestions submitted. Threshold is a practical processing way in the system. As long as the number of oral defense experts agreeing reaches the number requested, i.e., the threshold value
, related students pass the oral defense procedure. The research opens a new windows for the application of proxy signature technology in remote education and it is very important for us to popularize online oral defense system and enhance the security of modern remote education including online oral defense system.